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詹睿, 王东坡, 邓彩艳, 崔雷, 管卫, 梁行. 超声冲击对含根部缺陷铝合金FSW接头疲劳性能的影响[J]. 焊接学报, 2021, 42(6): 7-12. DOI: 10.12073/j.hjxb.20201220001
引用本文: 詹睿, 王东坡, 邓彩艳, 崔雷, 管卫, 梁行. 超声冲击对含根部缺陷铝合金FSW接头疲劳性能的影响[J]. 焊接学报, 2021, 42(6): 7-12. DOI: 10.12073/j.hjxb.20201220001
ZHAN Rui, WANG Dongpo, DENG Caiyan, CUI Lei, GUAN Wei, LIANG Hang. Effect of ultrasonic peening on fatigue performance of aluminum alloy FSW joints with root defects[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2021, 42(6): 7-12. DOI: 10.12073/j.hjxb.20201220001
Citation: ZHAN Rui, WANG Dongpo, DENG Caiyan, CUI Lei, GUAN Wei, LIANG Hang. Effect of ultrasonic peening on fatigue performance of aluminum alloy FSW joints with root defects[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2021, 42(6): 7-12. DOI: 10.12073/j.hjxb.20201220001

超声冲击对含根部缺陷铝合金FSW接头疲劳性能的影响

Effect of ultrasonic peening on fatigue performance of aluminum alloy FSW joints with root defects

  • 摘要: 针对含有根部“弱连接”缺陷的铝合金搅拌摩擦焊接头,采用4点弯曲疲劳试验方法,对比了超声冲击、超声喷丸及超声冲击 + 超声喷丸处理对疲劳性能的影响. 对比分析了试样处理前后根部“弱连接”形貌、显微硬度数值和残余应力分布,探究了其提升焊接接头疲劳性能的机制. 结果表明,相较于超声冲击仅对2 × 106周次以下疲劳强度的提高,超声喷丸、超声冲击 + 超声喷丸均显著提升了高周疲劳性能,对应于2 × 106周次,疲劳强度分别提高13%和40%. 超声冲击 + 超声喷丸复合处理不仅在接头根部缺陷处形成了致密的加工硬化层,而且利用超声喷丸处理引入了更宽的压缩残余应力区域,消除了超声冲击后可能残留的叠形缺陷,进而显著改善了疲劳性能.

     

    Abstract: Four-point bending fatigue tests were carried out to investigate the effects of ultrasonic impact treatment (UIT), ultrasonic peening (UP) and UIT + UP on the fatigue properties of aluminum alloy FSW joints with root “kissing bonding” defects, and the mechanism of the fatigue performance improvement was explored by analyzing the defect morphologies, microhardness values and residual stress distributions of the samples before and after treatments. Compared with the result that the fatigue strength of FSW joints treated by ultrasonic impact treatment at the root is improved only under 2 × 106 cycles, the results show that UP and UIT + UP can significantly improve the high-cycle fatigue performance, and the fatigue strength is increased by 13% and 40% respectively, corresponding to 2 × 106 cycles. UIT combined with UP cannot only form the compact work hardening layer at the root defects of the FSW joint, increase the microhardness, but also introduce the wider compressive residual stress region near the weld root by UP, eliminate the fold defects probably caused by UIT, significantly improving the fatigue performance.

     

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